diff --git a/src/ImageProcessorCore/Common/Helpers/Guard.cs b/src/ImageProcessorCore/Common/Helpers/Guard.cs
index c5efb01ea..1e9b3ea23 100644
--- a/src/ImageProcessorCore/Common/Helpers/Guard.cs
+++ b/src/ImageProcessorCore/Common/Helpers/Guard.cs
@@ -174,18 +174,13 @@ namespace ImageProcessorCore
         /// The error message, if any to add to the exception.
         /// </param>
         /// <exception cref="ArgumentException">
-        /// <paramref name="target"/> is null
+        /// <paramref name="target"/> is false
         /// </exception>
-        public static void IsTrue(bool target, string parameterName, string message = "")
+        public static void IsTrue(bool target, string parameterName, string message)
         {
             if (!target)
             {
-                if (!string.IsNullOrWhiteSpace(message))
-                {
-                    throw new ArgumentException(parameterName, message);
-                }
-
-                throw new ArgumentException(parameterName);
+                throw new ArgumentException(message, parameterName);
             }
         }
 
@@ -197,18 +192,13 @@ namespace ImageProcessorCore
         /// <param name="parameterName">The name of the parameter that is to be checked.</param>
         /// <param name="message">The error message, if any to add to the exception.</param>
         /// <exception cref="ArgumentException">
-        /// <paramref name="target"/> is null
+        /// <paramref name="target"/> is true
         /// </exception>
-        public static void IsFalse(bool target, string parameterName, string message = "")
+        public static void IsFalse(bool target, string parameterName, string message)
         {
             if (target)
             {
-                if (!string.IsNullOrWhiteSpace(message))
-                {
-                    throw new ArgumentException(parameterName, message);
-                }
-
-                throw new ArgumentException(parameterName);
+                throw new ArgumentException(message, parameterName);
             }
         }
     }
diff --git a/tests/ImageProcessorCore.Tests/Helpers/GuardTests.cs b/tests/ImageProcessorCore.Tests/Helpers/GuardTests.cs
index 7c33470c3..b92c4e0a8 100644
--- a/tests/ImageProcessorCore.Tests/Helpers/GuardTests.cs
+++ b/tests/ImageProcessorCore.Tests/Helpers/GuardTests.cs
@@ -207,7 +207,7 @@ namespace ImageProcessorCore.Tests.Helpers
         [Fact]
         public void IsTrueThrowsWhenArgIsFalse()
         {
-            Assert.Throws<ArgumentException>(() => Guard.IsTrue(false, "foo"));
+            Assert.Throws<ArgumentException>(() => Guard.IsTrue(false, "foo", "message"));
         }
 
         /// <summary>
@@ -216,7 +216,7 @@ namespace ImageProcessorCore.Tests.Helpers
         [Fact]
         public void IsTrueDoesThrowsWhenArgIsTrue()
         {
-            Exception ex = Record.Exception(() => Guard.IsTrue(true, "foo"));
+            Exception ex = Record.Exception(() => Guard.IsTrue(true, "foo", "message"));
             Assert.Null(ex);
         }
 
@@ -226,7 +226,7 @@ namespace ImageProcessorCore.Tests.Helpers
         [Fact]
         public void IsFalseThrowsWhenArgIsFalse()
         {
-            Assert.Throws<ArgumentException>(() => Guard.IsFalse(true, "foo"));
+            Assert.Throws<ArgumentException>(() => Guard.IsFalse(true, "foo", "message"));
         }
 
         /// <summary>
@@ -235,7 +235,7 @@ namespace ImageProcessorCore.Tests.Helpers
         [Fact]
         public void IsFalseDoesThrowsWhenArgIsTrue()
         {
-            Exception ex = Record.Exception(() => Guard.IsFalse(false, "foo"));
+            Exception ex = Record.Exception(() => Guard.IsFalse(false, "foo", "message"));
             Assert.Null(ex);
         }
     }